This. Although I think Altium is the more offensive toolset. The real fly in the ointment for open source hardware is the proprietary tooling.
I also ordered a few ICEsticks to play with the new icestorm open source toolchain. That FPGA is in no way comparable to a Spartan 6, though.
One problem with these new features is that they are somehow linked to new implementation of pcbnew's canvas which also implies somewhat different UI behavior (more windows-like, with selection of individual PCB elements and so on), which I generally don't like that much. Anyhow I recently used current kicad from bzr for somewhat non-trivial board (smallish FPGA in TQFP, ARM MCU, some analog RF, few LVDS lines).
It's still closed source (like Eagle). And it's Windows-only. And currently there's a DirectX conflict with VirtualBox so you can't use it there (reportedly it works in other VMs). But it's cheaper than paying $9000-a-seat-plus-$1000-a-year-maintainance for commercial Altium.